[erlang-questions] Decoding term with ei that has a map with long atom keys

Erik Axling <>
Thu Dec 11 07:43:38 CET 2014


Ok. I'll see if I can narrow it down some more. Thanks for checking this case at least. 

/axling

> 11 dec 2014 kl. 01:45 skrev Björn-Egil Dahlberg <>:
> 
> I think something else is going here.
> 
> Just to be sure, I added your specific example to erl_interface tests and that passed without problems.
> 
> If ei_decode_version(but, &index, &version) fails, that typically means you have corrupted your binary somewhere.
> ei_decode_version checks if the leading byte of the binary is 131 (the current version).
> 
> // Björn-Egil
> 
> 2014-12-11 0:18 GMT+01:00 Erik Axling <>:
>> Hello!
>> 
>> I ran into an issue where ei_decode_version seems to fail when trying to decode a term that contains a map with large atom keys.
>> 
>> My message that is sent to the port looks something like this:
>> 
>> erlang:port_command(Port, term_to_binary({cmd, type, undefined, #{asdadasdsadasdasdasdasda=>sadsadsada,asdsadsadsadsadsadsadasdasdsadasb=>sdsdsdsdsdb})).
>> 
>> This fails in my port pretty quickly when doing ei_decode_version(but, &index, &version).
>> 
>> It works when i send a message similar to
>> 
>> erlang:port_command(Port, term_to_binary({cmd, type, undefined, #{b=>s, a=>s})).
>> 
>> Erlang version is :
>> Erlang/OTP 17 [erts-6.2] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false]
>> 
>> Eshell V6.2  (abort with ^G)
>> 
>> Running this on a Macbook Air if that is interesting.
>> 
>> 
>> I know that the maps feature is still a bit experimental so just would like to know if this is a known issue of if I'm understanding something wrong?
>> 
>> /axling 
>> 
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>> 
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>> 
> 
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